NEW YORK (AP) — Brooke Astor’s 85-year-old son has been convicted of plundering the philanthropist’s nearly $200 million fortune.

Anthony Marshall now faces a mandatory jail sentence of at least one year for exploiting Astor’s failing mind to help himself to her money.

The jury found him guilty of two serious counts, first-degree grand larceny and scheming to defraud, but acquitted him on some others. The jury also convicted estate lawyer Francis X. Morrissey Jr., 66, of scheming to defraud Astor.

Jurors delivered their verdict Thursday afternoon to end a five-month trial that revealed the New York society doyenne’s sad decline. She was 105 and had Alzheimer’s disease when she died in 2007.

Defense lawyers said Astor was lucid when she bequeathed Marshall millions of dollars.